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LA8638NV

Low-Voltage Compander IC for Cordless Telephones

SANYO -> Panasonic 

Ordering number : ENN6627

Monolithic Linear IC

LA8638NV

Low-Voltage Compander IC

for Cordless Telephones

Overview

The LA8638NV provides dynamic range expansion, noise

suppression for enhancing the quality of audio signals in

cordless telephones and other communications systems.

This single chip provides the functions that make it ideal

for cordless telephones: a compressor with a logarithmic

compression ratio of 1/2, expander with a logarithmic

expansion ratio of 2, splatter filter, microphone amplifier,

BTL amplifier, waveform shaper for the receiving signal,

muting for both receiving and transmitting signals, and

standby operation.

Functions

• Transmitter circuits: compressor, microphone amplifier,

limiter (IDC), muting, output level changes to user-

specified levels, and splatter filter

• Receiver circuits: expander, buffer amplifier for filters,

muting, output level changes to user-specified levels,

and BTL amplifier

• Other circuits: waveform shaper for the receiving signal

and standby operation

speaker with a load of 2 kΩ

• Standby operation that conserves battery power during

intermittent reception by disabling all but the waveform

shaper for the receiving signal

• Built-in splatter filter with user-specified fc

• Low-voltage operation (1.8 V to 5.5 V)

Package Dimensions

unit: mm

3191A-SSOP30

[LA8638NV]

30

16

1

15

0.15

9.75

Features

• Full processing of baseband signals for both receiving

0.22

0.65

(0.33)

and transmitting signals

• Built-in BTL receiver amplifier for driving a ceramic

SANYO: SSOP30

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Maximum power supply voltage

Maximum power dissipation

Operating temperature

Storage temperature

Symbol

VCC max

Pd max

Topr

Tstg

Ta ≤ 75°C

Conditions

Ratings

Unit

7.0

V

100

mW

–20 to +75

°C

–40 to +125

°C

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

N1403TN (OT) No. 6627-1/16

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